зеркало из https://github.com/mozilla/moz-skia.git
245 строки
8.8 KiB
C++
245 строки
8.8 KiB
C++
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/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "Test.h"
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#include "SkMath.h"
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#include "SkMatrix.h"
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#include "SkRandom.h"
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static bool nearly_equal_scalar(SkScalar a, SkScalar b) {
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// Note that we get more compounded error for multiple operations when
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// SK_SCALAR_IS_FIXED.
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#ifdef SK_SCALAR_IS_FLOAT
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const SkScalar tolerance = SK_Scalar1 / 200000;
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#else
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const SkScalar tolerance = SK_Scalar1 / 1024;
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#endif
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return SkScalarAbs(a - b) <= tolerance;
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}
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static bool nearly_equal(const SkMatrix& a, const SkMatrix& b) {
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for (int i = 0; i < 9; i++) {
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if (!nearly_equal_scalar(a[i], b[i])) {
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printf("not equal %g %g\n", (float)a[i], (float)b[i]);
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return false;
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}
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}
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return true;
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}
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static bool is_identity(const SkMatrix& m) {
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SkMatrix identity;
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identity.reset();
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return nearly_equal(m, identity);
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}
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static void test_flatten(skiatest::Reporter* reporter, const SkMatrix& m) {
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// add 100 in case we have a bug, I don't want to kill my stack in the test
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char buffer[SkMatrix::kMaxFlattenSize + 100];
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uint32_t size1 = m.flatten(NULL);
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uint32_t size2 = m.flatten(buffer);
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REPORTER_ASSERT(reporter, size1 == size2);
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REPORTER_ASSERT(reporter, size1 <= SkMatrix::kMaxFlattenSize);
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SkMatrix m2;
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uint32_t size3 = m2.unflatten(buffer);
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REPORTER_ASSERT(reporter, size1 == size2);
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REPORTER_ASSERT(reporter, m == m2);
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char buffer2[SkMatrix::kMaxFlattenSize + 100];
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size3 = m2.flatten(buffer2);
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REPORTER_ASSERT(reporter, size1 == size2);
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REPORTER_ASSERT(reporter, memcmp(buffer, buffer2, size1) == 0);
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}
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void test_matrix_max_stretch(skiatest::Reporter* reporter) {
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SkMatrix identity;
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identity.reset();
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REPORTER_ASSERT(reporter, SK_Scalar1 == identity.getMaxStretch());
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SkMatrix scale;
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scale.setScale(SK_Scalar1 * 2, SK_Scalar1 * 4);
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REPORTER_ASSERT(reporter, SK_Scalar1 * 4 == scale.getMaxStretch());
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SkMatrix rot90Scale;
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rot90Scale.setRotate(90 * SK_Scalar1);
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rot90Scale.postScale(SK_Scalar1 / 4, SK_Scalar1 / 2);
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REPORTER_ASSERT(reporter, SK_Scalar1 / 2 == rot90Scale.getMaxStretch());
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SkMatrix rotate;
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rotate.setRotate(128 * SK_Scalar1);
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REPORTER_ASSERT(reporter, SkScalarAbs(SK_Scalar1 - rotate.getMaxStretch()) <= SK_ScalarNearlyZero);
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SkMatrix translate;
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translate.setTranslate(10 * SK_Scalar1, -5 * SK_Scalar1);
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REPORTER_ASSERT(reporter, SK_Scalar1 == translate.getMaxStretch());
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SkMatrix perspX;
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perspX.reset();
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perspX.setPerspX(SkScalarToPersp(SK_Scalar1 / 1000));
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REPORTER_ASSERT(reporter, -SK_Scalar1 == perspX.getMaxStretch());
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SkMatrix perspY;
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perspY.reset();
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perspY.setPerspX(SkScalarToPersp(-SK_Scalar1 / 500));
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REPORTER_ASSERT(reporter, -SK_Scalar1 == perspY.getMaxStretch());
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SkMatrix baseMats[] = {scale, rot90Scale, rotate,
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translate, perspX, perspY};
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SkMatrix mats[2*SK_ARRAY_COUNT(baseMats)];
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for (size_t i = 0; i < SK_ARRAY_COUNT(baseMats); ++i) {
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mats[i] = baseMats[i];
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bool invertable = mats[i].invert(&mats[i + SK_ARRAY_COUNT(baseMats)]);
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REPORTER_ASSERT(reporter, invertable);
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}
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SkRandom rand;
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for (int m = 0; m < 1000; ++m) {
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SkMatrix mat;
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mat.reset();
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for (int i = 0; i < 4; ++i) {
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int x = rand.nextU() % SK_ARRAY_COUNT(mats);
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mat.postConcat(mats[x]);
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}
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SkScalar stretch = mat.getMaxStretch();
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if ((stretch < 0) != mat.hasPerspective()) {
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stretch = mat.getMaxStretch();
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}
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REPORTER_ASSERT(reporter, (stretch < 0) == mat.hasPerspective());
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if (mat.hasPerspective()) {
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m -= 1; // try another non-persp matrix
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continue;
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}
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// test a bunch of vectors. None should be scaled by more than stretch
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// (modulo some error) and we should find a vector that is scaled by
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// almost stretch.
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static const SkScalar gStretchTol = (105 * SK_Scalar1) / 100;
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static const SkScalar gMaxStretchTol = (97 * SK_Scalar1) / 100;
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SkScalar max = 0;
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SkVector vectors[1000];
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for (size_t i = 0; i < SK_ARRAY_COUNT(vectors); ++i) {
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vectors[i].fX = rand.nextSScalar1();
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vectors[i].fY = rand.nextSScalar1();
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if (!vectors[i].normalize()) {
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i -= 1;
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continue;
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}
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}
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mat.mapVectors(vectors, SK_ARRAY_COUNT(vectors));
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for (size_t i = 0; i < SK_ARRAY_COUNT(vectors); ++i) {
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SkScalar d = vectors[i].length();
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REPORTER_ASSERT(reporter, SkScalarDiv(d, stretch) < gStretchTol);
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if (max < d) {
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max = d;
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}
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}
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REPORTER_ASSERT(reporter, SkScalarDiv(max, stretch) >= gMaxStretchTol);
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}
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}
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void TestMatrix(skiatest::Reporter* reporter) {
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SkMatrix mat, inverse, iden1, iden2;
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mat.reset();
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mat.setTranslate(SK_Scalar1, SK_Scalar1);
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mat.invert(&inverse);
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iden1.setConcat(mat, inverse);
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REPORTER_ASSERT(reporter, is_identity(iden1));
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mat.setScale(SkIntToScalar(2), SkIntToScalar(2));
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mat.invert(&inverse);
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iden1.setConcat(mat, inverse);
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REPORTER_ASSERT(reporter, is_identity(iden1));
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test_flatten(reporter, mat);
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mat.setScale(SK_Scalar1/2, SK_Scalar1/2);
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mat.invert(&inverse);
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iden1.setConcat(mat, inverse);
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REPORTER_ASSERT(reporter, is_identity(iden1));
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test_flatten(reporter, mat);
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mat.setScale(SkIntToScalar(3), SkIntToScalar(5), SkIntToScalar(20), 0);
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mat.postRotate(SkIntToScalar(25));
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REPORTER_ASSERT(reporter, mat.invert(NULL));
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mat.invert(&inverse);
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iden1.setConcat(mat, inverse);
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REPORTER_ASSERT(reporter, is_identity(iden1));
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iden2.setConcat(inverse, mat);
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REPORTER_ASSERT(reporter, is_identity(iden2));
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test_flatten(reporter, mat);
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test_flatten(reporter, iden2);
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// rectStaysRect test
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{
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static const struct {
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SkScalar m00, m01, m10, m11;
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bool mStaysRect;
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}
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gRectStaysRectSamples[] = {
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{ 0, 0, 0, 0, false },
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{ 0, 0, 0, SK_Scalar1, false },
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{ 0, 0, SK_Scalar1, 0, false },
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{ 0, 0, SK_Scalar1, SK_Scalar1, false },
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{ 0, SK_Scalar1, 0, 0, false },
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{ 0, SK_Scalar1, 0, SK_Scalar1, false },
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{ 0, SK_Scalar1, SK_Scalar1, 0, true },
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{ 0, SK_Scalar1, SK_Scalar1, SK_Scalar1, false },
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{ SK_Scalar1, 0, 0, 0, false },
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{ SK_Scalar1, 0, 0, SK_Scalar1, true },
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{ SK_Scalar1, 0, SK_Scalar1, 0, false },
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{ SK_Scalar1, 0, SK_Scalar1, SK_Scalar1, false },
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{ SK_Scalar1, SK_Scalar1, 0, 0, false },
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{ SK_Scalar1, SK_Scalar1, 0, SK_Scalar1, false },
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{ SK_Scalar1, SK_Scalar1, SK_Scalar1, 0, false },
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{ SK_Scalar1, SK_Scalar1, SK_Scalar1, SK_Scalar1, false }
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};
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for (size_t i = 0; i < SK_ARRAY_COUNT(gRectStaysRectSamples); i++) {
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SkMatrix m;
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m.reset();
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m.set(SkMatrix::kMScaleX, gRectStaysRectSamples[i].m00);
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m.set(SkMatrix::kMSkewX, gRectStaysRectSamples[i].m01);
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m.set(SkMatrix::kMSkewY, gRectStaysRectSamples[i].m10);
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m.set(SkMatrix::kMScaleY, gRectStaysRectSamples[i].m11);
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REPORTER_ASSERT(reporter,
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m.rectStaysRect() == gRectStaysRectSamples[i].mStaysRect);
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}
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}
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mat.reset();
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mat.set(SkMatrix::kMScaleX, SkIntToScalar(1));
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mat.set(SkMatrix::kMSkewX, SkIntToScalar(2));
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mat.set(SkMatrix::kMTransX, SkIntToScalar(3));
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mat.set(SkMatrix::kMSkewY, SkIntToScalar(4));
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mat.set(SkMatrix::kMScaleY, SkIntToScalar(5));
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mat.set(SkMatrix::kMTransY, SkIntToScalar(6));
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SkScalar affine[6];
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REPORTER_ASSERT(reporter, mat.asAffine(affine));
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#define affineEqual(e) affine[SkMatrix::kA##e] == mat.get(SkMatrix::kM##e)
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REPORTER_ASSERT(reporter, affineEqual(ScaleX));
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REPORTER_ASSERT(reporter, affineEqual(SkewY));
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REPORTER_ASSERT(reporter, affineEqual(SkewX));
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REPORTER_ASSERT(reporter, affineEqual(ScaleY));
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REPORTER_ASSERT(reporter, affineEqual(TransX));
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REPORTER_ASSERT(reporter, affineEqual(TransY));
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#undef affineEqual
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mat.set(SkMatrix::kMPersp1, SkScalarToPersp(SK_Scalar1 / 2));
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REPORTER_ASSERT(reporter, !mat.asAffine(affine));
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test_matrix_max_stretch(reporter);
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}
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#include "TestClassDef.h"
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DEFINE_TESTCLASS("Matrix", MatrixTestClass, TestMatrix)
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